Study of Radio Frequency Interference Mitigation Method Based on Wavelet Transform |
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| Institution: | 1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030;2. University of Chinese Academy of Sciences, Beijing 100049;3. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210023;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;2. Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;3. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;2. Key Laboratory foe Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;3. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026;1. National Space Science Center, Chinese Academy of Sciences, Beijing 100190;2. Key Laboratory of Science and Technology on Environmental Space Situation Awareness, Chinese Academy of Sciences, Beijing 100190;3. University of Chinese Academy of Sciences, Beijing 100049;1. Yunnan Astronomical Observatories, Chinese Academy of Sciences, Kunming 650011;2. University of Chinese Academy of Sciences, Beijing 100049;3. Institute of Space Physics, Luoyang Normal University, Luoyang 471934;4. Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;2. CAS Key Laboratory of Planetary Sciences, Nanjing 210023;3. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026;1. School of Physics and Technology, Xinjiang University, Urumqi 830046;2. Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011;3. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Urumqi 830011 |
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| Abstract: | In radio astronomy observations, radio frequency interference (RFI) is mixed into the telescope receiving system in various forms. The existence of RFI brings misjudgment to the observation or reduces the observational signal-to-noise ratio. In recent years, the domestic and overseas radio astronomy has developed rapidly. Large-scale radio telescopes and telescope arrays at home and abroad have been constructed successively. Observation sensitivity is greatly improved, and the influence of RFI is particularly prominent. With the development of science and technology and the intensification of human activities, the RFI has become increasingly serious and irreversible. We propose to use the two-dimensional discrete wavelet transform method to analyze the data of radio astronomy observations, and to perform wavelet transform on the time-frequency sequence output by the telescope system. According to the wavelet coefficients, the every component in the original signal is separated, and the corresponding threshold value is obtained by the statistics on each component. Each component is compared with the threshold to identify the interference component, and to mark it for removal. This method is used to process the actual observation data. The results show that this method can well mark and eliminate the interference signal, and improve the observational signal-to-noise ratio. |
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| Keywords: | Radio frequency interference (RFI) wavelet transform techniques: image processing methods: data analysis |
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